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virt_cacard

Virtual CAC using libcacard, virtualsmartcard's vpcd and softhsm2 to provide PCSC accessible virtual smart card.

How it works

schema

The virtual pcscd provides a socket based interface on one side, and the classic PCSC API on the other.

To use virt_cacard, you need a program (such as OpenSC's tools that uses the PCSC API to communicate with smart cards. The vpcd relays those communications through its socket. This should work with any application using the PC/SC API, but virt_cacard was designed to help with the CI/CD of OpenSC.

The virtual smart card, emulated with libcacard, connects to the socket and can then get (and reply to) APDUs from the application. From the point of view of the application, the process is transparent.

OpenSC tests: virt_cacard

How to build virt_cacard

./autogen.sh
./configure
make

Usage

The fastest way to start is to install virtualsmartcard's module vpcd for pcscd (see above), configure softhsm with default certificates and start virt_cacard:

$ . setup-softhsm2.sh
$ ./virt_cacard

After that, you should be able to access virtual smart card through OpenSC:

$ pkcs11-tool -L
Available slots:
Slot 0 (0x0): Virtual PCD 00 00
  token label        : CAC II
  token manufacturer : Common Access Card
  token model        : PKCS#15 emulated
  token flags        : login required, rng, token initialized, PIN initialized
  hardware version   : 0.0
  firmware version   : 0.0
  serial num         : 000058bd002c19b5
  pin min/max        : 4/8
Slot 1 (0x4): Virtual PCD 00 01
  (empty)
Slot 2 (0x8): Virtual PCD 00 02
  (empty)
Slot 3 (0xc): Virtual PCD 00 03
  (empty)

If you use Fedora or RHEL, make sure to configure p11-kit to not load OpenSC for virt_cacard:

# echo "disable-in: virt_cacard" >> /usr/share/p11-kit/modules/opensc.module

otherwise the above command will hang (recursive access to pcscd).

The virtual smart card is automatically started in inserted state. To simulate smart card removal and insertion events, you can either kill the virt_cacard process or send SIGUSR1 to remove the card and SIGUSR2 to reinsert the card again.

This can be done by running virt_cacard with -r switch to remove card and -i to insert card back again. This will automatically send signals to all virt_cacard processes in the system. If you want to limit which process should be used (if there are multiple virtual smart cards or virt_cacard runs under valgrind), you can use -p switch to specify PID.

Debugging

to get debug logs from running virt_cacard, set G_MESSAGES_DEBUG=virt_cacard environment variable for the process, for example:

G_MESSAGES_DEBUG=virt_cacard ./virt_cacard

To get debug logs from libcacard, use the same variable with libcacard value.